505120161 has 16 divisors (see below), whose sum is σ = 828915584. Its totient is φ = 266436864.

The previous prime is 505120159. The next prime is 505120237. The reversal of 505120161 is 161021505.

It is not a de Polignac number, because 505120161 - 2¹ = 505120159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (505120141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924856 + ... + 925401.

It is an arithmetic number, because the mean of its divisors is an integer number (51807224).

Almost surely, 2^505120161 is an apocalyptic number.

It is an amenable number.

505120161 is a deficient number, since it is larger than the sum of its proper divisors (323795423).

505120161 is a wasteful number, since it uses less digits than its factorization.

505120161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850280.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 505120161 is about 22474.8784423854. The cubic root of 505120161 is about 796.4005800289.

Adding to 505120161 its reverse (161021505), we get a palindrome (666141666).

The spelling of 505120161 in words is "five hundred five million, one hundred twenty thousand, one hundred sixty-one".